[deanhills]

sorry to say that I don't know anything much about control panels like vestacp. I never use them. I always read up online about settings and concepts and configure myself manually.
cause If i use vestacp then I will have to know its inner working a bit and where it keeps its settings and how it handles the changes and all that. or I will have bad days thinking about all the things that might go wrong. May be I have slight ocd. I am never happy working with blackbox kind of things.

that's why I didn't offer to help you. also I dislike the idea of having both name servers residing on the same physical system, even if they have their own ip. it is plain dumb.
also using your own name server is dumb too. it confers no benefits and a lot of problems or potential problems.
I always keep checking monthly reports on free name server rankings. cloudflare almost always tops. that's why I love them.

sorry for the strong words... I get carried away.

I'm happy with the feedback @rudra.  It's quality feedback.  When I do my DNS inspect with the tools on the Web, they say the same thing.  I.e. having both name servers residing on the same physical system.  I didn't know about own name server being dumb though.  I thought it was kind'a neat to have the same name servers as the domain I'm using.  Like a nice "set" - same domain, same name servers. Like who wants a nameserver that is called bruno or cynthia or all those names Cloudflare is using.

I still have to develop a flavour for Cloudflare.  I spent some time with them last week, and they do have lots to offer of course.